Smart Structures and Systems

  • 제27권5호
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  • Pages.769-781
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  • 2021
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR Code

Design and analysis of plate-type eddy-current damper with high energy-dissipation capability

  • Shan, Jiazeng (Department of Disaster Mitigation for Structures, Tongji University) ;
  • Liu, Jie (Department of Disaster Mitigation for Structures, Tongji University) ;
  • Loong, Cheng Ning (Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology) ;
  • Wu, Weichao (Department of Disaster Mitigation for Structures, Tongji University)
  • 투고 : 2020.05.23
  • 심사 : 2021.01.06
  • 발행 : 2021.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

A plate-type eddy-current damper with high energy-dissipation capability is designed and analyzed. The damper is configured in a dimension of 270 mm × 500 mm × 80 mm by employing 16 pairs of rectangular magnets and a rectangular copper plate. The paired magnets are arranged as two rows of 4-by-4 arrays with polarities alternating along the moving direction, while the copper plate is embedded inside two rows of magnets. A finite-element model is developed to investigate eddy-current force. The damping coefficient of damper under a constant velocity of 0.2 m/s is 24.44 kN-s/m. The eddy-current force under harmonic motion can be fitted as a sum of a linear elastic force and a linear damping force. The stiffness coefficient is increased by 77 times and the damping coefficient is reduced relatively by 19%, for vibration frequency increased from 0.5 to 10.0 Hz. The sensitivity of stiffness and damping coefficients on the physical dimensions of magnet and copper plate are discussed. The phase lag is sensitive to copper-plate thickness but insensitive to clear gap between two rows of magnets. The damper is implemented on a based-isolated structure. It is shown that the damper could reduce the peak of base drift and absolute acceleration response spectra by 71.9% and 73.1%, respectively.

키워드

과제정보

This study is sponsored by the National Science Foundation of China (Grant No: 51878483), and the Key Laboratory of Performance Evolution and Control for Engineering Structures (Tongji University), Ministry of Education (No. 2019KF-6). The third author would like to thank the financial support from the Hong Kong PhD Fellowship Scheme (HKPFS) provided by the Research Grants Council of the HKSAR.

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